I've found one article on the JW library discussing the issue. It's in the Awake 2002 1/22, although it identifies it as being illegal or 'dishonest' it does not deal with it from a congregational point of view.
Count the Cost Before Migrating for Economic Reasons
In view of the many criminal gangs involved in trafficking migrants and the difficulty of immigrating legally to countries of the developed world, husbands and fathers should carefully consider the following questions before making a decision.
1. Is our economic situation really so desperate that one or all of the family must move to a country where wages are higher?
2. How much debt would we incur to finance the trip, and how will the debt be repaid?
3. Is it worth breaking up the family for economic advantages that may prove unrealistic? Many illegal migrants find it practically impossible to obtain regular employment in developed countries.
4. Should I believe the stories about high wages and social benefits? The Bible says that “anyone inexperienced puts faith in every word, but the shrewd one considers his steps.”—Proverbs 14:15.
5. What guarantee do I have that we would not be putting ourselves in the hands of a criminal organization?
6. If such a criminal group did organize the journey, do I understand that my wife—or my daughter—might well find herself forced to work as a prostitute?
7. Do I realize that if I enter a country as an illegal immigrant, I may be unable to obtain fixed employment and could be repatriated, losing all the money I have invested in the journey?
8. Do I want to consider becoming an illegal immigrant or resorting to dishonest measures in order to gain admittance to a wealthier country?—Matthew 22:21; Hebrews 13:18.